630

[Math.]  A triangular number (sum of all integers from 1 to 35): 630 = 1+2+…+34+35.

 

[History]  The height and the span (feet) of the stainless steel arch “Gateway to the West”, in St. Louis, Missouri, was built from 1963 to 28 October 1965, a monument of the National Westward Expansion. It was designed by Finnish-American architecture Eero Saarinen.

 

[Phone]  By NANPA/U.S. rules, the number of 3-digit area codes available is 630. They excudes the numbers n11, n22, n33, n44, n55, n66, n77, n88, n99, n9x, 37x and 96x, and n cannot be 0 or 1. (NANPA: North American Numbering Plan Administration).

 

[World]  The ISO country code for Puerto Rico. (ISO-3166)

 

631

[Math.]  A prime number.

 

[Math.]  6313+4613+1933 = 356,400,829 = 7093. The smallest prime whose cube is sum of 3 different cubes of prime numbers.

 

632…

 

633

[Math.]  6333 = 253,636,137 = (2–5+3+636+1+3–7)3.

 

634 

[World]  The ISO country code for Qatar. (ISO-3166)

 

635

[Math.]  6354 = 16,25,9,0400,625 is a concatenation of square numbers.

 

636

 

637

[Math.]  6373 = 258,474,853 = (258–474+853)3.

 

638

[Trivia]  Documentary and book, “638 Ways to Kill Castro”.

 

[World]  The ISO country code for Reunion. (ISO-3166)

 

639

[Math.]  Sum of prime numbers up to 71 is 639, which is divisible by 71.

 

630-639

[Library]  Numbers 600-699 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Applied Sciences and Technology (Medicine, Agriculture and Engineering…). Numbers 630-619 are for books in Agriculture and Hunting, Fishing…